These covers, $39.99 from Sharper Image, plug into the cigarette lighter and circulate the air around you — one review suggests adding a frozen water bottle to the pocket in the front to help keep even cooler.

Just like tires can have too little air pressure in the winter, they can end up with too *much* air pressure in the summer, according to Car Talk. That can wear out your tires faster, or in certain conditions cause tire blowouts. Check your car's manual for your manufacturer's recommended tire PSI.

11.Wash your car in small sections — soap, then rinse, one or two panels at a time. (Or go through the car wash.)

This is especially helpful if you live in a dry, hot climate; you don't want the water to evaporate too quickly and leave dried soap spots all over your paint. Get more summer car washing tips from Car Cleaning Guru.

13.Adjust your car's emergency kit so you have everything you need for warmer weather.

Among other things, you'll want to make sure you have one gallon plus one bottle of water per person who regularly rides in your car — especially if you're going to take a road trip. Get the whole checklist from NAPA's Know How Blog.